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What's a good (original) science fair project? It needs to be an experimental one, as in testing something 3 times

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What's a good (original) science fair project? It needs to be an experimental one, as in testing something 3 times to see the changes and results. Sadly I

What's a good (original) science fair project? It needs to be an experimental one, as in testing something 3 times to see the changes and results. Sadly I can't do a show one (lemon battery, volcano,
You could do high frequency noises and people of different ages to see if they can hear it or not (the higher the noise the harder it is to hear, someone who is 15 can hear a higher pitch than someone who is 50) ...

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